EP3949631B1 - Verfahren und vorrichtung zum senden und empfangen von sidelink-feedback in einem drahtloskommunikationssystem - Google Patents

Verfahren und vorrichtung zum senden und empfangen von sidelink-feedback in einem drahtloskommunikationssystem Download PDF

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Publication number
EP3949631B1
EP3949631B1 EP20798286.9A EP20798286A EP3949631B1 EP 3949631 B1 EP3949631 B1 EP 3949631B1 EP 20798286 A EP20798286 A EP 20798286A EP 3949631 B1 EP3949631 B1 EP 3949631B1
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Prior art keywords
terminal
resource
slot
transmitted
information
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English (en)
French (fr)
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EP3949631A1 (de
EP3949631A4 (de
Inventor
Jeongho Yeo
Hyunseok Ryu
Cheolkyu SHIN
Sungjin Park
Jinyoung Oh
Jonghyun BANG
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority claimed from KR1020190058405A external-priority patent/KR20200127807A/ko
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Publication of EP3949631A4 publication Critical patent/EP3949631A4/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0087—Timing of allocation when data requirements change
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the disclosure relates generally to a method and an apparatus for transmitting feedback on a data transmission in a sidelink, and more particularly, to a method for configuring a hybrid automatic repeat request-acknowledgment (HARQ-ACK) codebook and a method for determining a timing of transmitting a feedback when data is transmitted to a sidelink and HARQ-ACK information about the corresponding data is transmitted from a receiving terminal to a terminal having transmitted the data.
  • HARQ-ACK hybrid automatic repeat request-acknowledgment
  • the 5G or pre-5G communication system is also referred to as a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is implemented in higher frequency (mmWave) bands (e.g., 60GHz bands), so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO full dimensional MIMO
  • array antenna analog beam forming, and large scale antenna techniques are discussed in 5G communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet is now evolving to the Internet of things (IoT) where distributed entities exchange and process information without human intervention.
  • IoE Internet of everything
  • technology elements such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “security technology” have been demanded for IoT implementation, a sensor network, a machine-to-machine (M2M) communication, machine type communication (MTC), and so forth have been researched.
  • M2M machine-to-machine
  • MTC machine type communication
  • Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things.
  • IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications.
  • 5G communication systems to IoT networks.
  • technologies such as a sensor network, MTC, and M2M communication may be implemented by beamforming, MIMO, and array antennas.
  • Application of a cloud RAN as the above-described big data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
  • a terminal transmits, to a base station, HARQ-ACK feedback information of the data transmitted from the base station on a configured resource.
  • a receiving terminal may transmit an HARQ-ACK feedback to a transmitting terminal.
  • Such HARQ-ACK feedback may be used as information for the transmitting terminal to determine retransmission or the like.
  • a physical sidelink feedback channel (PSFCH) may be used as a physical channel on which the receiving terminal transmits the HARQ-ACK feedback.
  • WO2020/067782 A1 of SAMSUNG ELECTRONICS and WO2017/192009 A1 of LG ELECTRONICS disclose prioritization of HARQ-ACK for a data received at UE, based on the priority of the received data.
  • the disclosure provides a method and an apparatus for transmitting a HARQ-ACK feedback in a communication between terminals.
  • a method is provided that performed by a terminal in a communication system.
  • First sidelink data and second sidelink data are received from one or more terminals. It is determined whether a first resource for transmitting first feedback information for the first sidelink data and a second resource for transmitting second feedback information for the second sidelink data overlap each other. When the first resource and the second resource overlap each other, feedback information corresponding to one of the first feedback information and the second feedback information having a higher priority, is transmitted to the one or more terminals.
  • a priority of each of the first feedback information and the second feedback information is based on sidelink control information scheduling each of the first sidelink data and the second sidelink data and resources for feedback information are identified based on a minimum number of slots between sidelink data and corresponding feedback information.
  • a terminal in a communication system includes a transceiver and a controller.
  • the controller is configured to receive, from one or more terminals via the transceiver, first sidelink data and second sidelink data.
  • the controller is also configured to determine whether a first resource for transmitting first feedback information for the first sidelink data and a second resource for transmitting second feedback information for the second sidelink data overlap each other.
  • the controller is further configured to transmit, to the one or more terminals via the transceiver, feedback information corresponding to one of the first feedback information and the second feedback information having a higher priority.
  • a priority of each of the first feedback information and the second feedback information is based on sidelink control information scheduling each of the first sidelink data and the second sidelink data, and resources for feedback information are identified based on a minimum number of slots between sidelink data and corresponding feedback information.
  • the receiving terminal can effectively transmit the HARQ-ACK feedback to the transmitting terminal on the sidelink.
  • Effects that can be obtained in the disclosure are not limited to the above-described effects, and other unmentioned effects can be clearly understood by those of ordinary skill in the art to which the disclosure pertains from the following description.
  • the term "embodiment” or “embodiment of the disclosure” can be understood as an example suitable for understanding the invention.
  • the most pertinent figures describing the embodiment of the invention is on figure 18 , whereas the embodiment of the invention is provided in what is named as the first embodiment, describing figure 18 ..
  • supported services may be divided into categories of an enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable and low-latency communications
  • the eMBB may be a service aimed at high-speed transmission of high-capacity data
  • the mMTC may be a service aimed at minimization of a terminal power and accesses of a plurality of terminals
  • the URLLC may be a service aimed at high reliability and low latency.
  • Different requirements may be applied in accordance with the kinds of services applied to the terminal.
  • each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations can be implemented by computer program instructions.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks.
  • These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
  • each block of the flowchart illustrations may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • the term “unit”, as used herein, means, but is not limited to, a software or hardware component, such as field programmable gate array (FPGA) or application specific integrated circuit (ASIC), which performs certain tasks.
  • the term “unit” is not meant to be limited to software or hardware.
  • the term “unit” may advantageously be configured to reside on the addressable storage medium and configured to execute on one or more processors.
  • the term “unit” may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • a unit may include one or more processors.
  • a wireless communication system was initially developed for the purpose of providing a voice-oriented service, but it has been expanded to, for example, a broadband wireless communication system that provides a high-speed and high-quality packet data service together with the communication standards, such as 3GPP high speed packet access (HSPA), long term evolution (LTE) or evolved universal terrestrial radio access (E-UTRA), LTE-Advanced (LTE-A), 3GPP2 high rate packet data (HRPD), ultra-mobile broadband (UMB), and IEEE 802.16e.
  • HSPA high speed packet access
  • LTE long term evolution
  • E-UTRA evolved universal terrestrial radio access
  • LTE-A LTE-Advanced
  • HRPD 3GPP2 high rate packet data
  • UMB ultra-mobile broadband
  • IEEE 802.16e IEEE 802.16e.
  • 5G or NR communication standards have been developed.
  • the downlink (DL) and uplink (UL) adopt orthogonal frequency division multiplexing (OFDM) schemes. More specifically, the DL adopts a cyclic-prefix OFDM (CP-OFDM) scheme, and the UL adopts a discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme in addition to the CP-OFDM.
  • the UL means a radio link in which a terminal (or user equipment (UE) or mobile station (MS)) transmits data or a control signal to a base station (or gNodeB or base station (BS)), and the DL means a radio link in which the base station transmits data or a control signal to the terminal.
  • UE user equipment
  • MS mobile station
  • BS base station
  • Such a multi-access scheme may discriminate data or control information of respective users from each other by allocating and operating time-frequency resources on which the data or control information of the respective users is to be carried so that the time-frequency resources do not overlap each other, that is, so as to establish orthogonality.
  • the NR system adopts a hybrid automatic repeat request (HARQ) scheme in which a physical layer retransmits the corresponding data if decoding failure occurs during an initial transmission.
  • a receiver may transmit information (negative acknowledgement (NACK)) for notifying a transmitter of the decoding failure if the receiver has not accurately decoded the data, and the transmitter may make a physical layer retransmit the corresponding data.
  • NACK negative acknowledgement
  • the receiver may combine the data that is retransmitted by the transmitter with the previous data of which the decoding has failed to heighten the data reception performance.
  • the HARQ scheme may transmit information (acknowledgement (ACK)) for notifying of a decoding success to the transmitter, so that the transmitter can transmit new data.
  • ACK acknowledgement
  • FIG. 1 is a diagram illustrating the basic structure of a time-frequency domain that is a radio resource region in which data or a control channel is transmitted on a downlink or an uplink in an NR system.
  • a horizontal axis represents a time domain
  • a vertical axis represents a frequency domain
  • the minimum transmission unit is an OFDM symbol
  • N symb OFDM symbols 102 constitute one slot 106.
  • the length of the subframe is defined as 1.0 ms
  • a radio frame is defined as 10 ms.
  • the minimum transmission unit is a subcarrier, and the transmission bandwidth of the whole system is composed of N BW subcarriers 104 in total.
  • the basic unit of resources is a resource element (RE) 112, which may be expressed by an OFDM symbol index and a subcarrier index.
  • a resource block (RB) 108 or a physical resource block (PRB) is defined by N RB contiguous subcarriers 110 in the frequency domain.
  • the minimum transmission unit of data is the RB as described above.
  • the data rate may be increased in proportion to the number of RBs that are scheduled to the terminal.
  • the DL transmission bandwidth and the UL transmission bandwidth may differ from each other.
  • a channel bandwidth indicates an RF bandwidth corresponding to the system transmission bandwidth.
  • Tables 1 and 2 present a part of the corresponding relationship among the system transmission bandwidth that is defined by the NR system in a frequency band that is lower than 6 GHz and in a frequency band that is higher than 6 GHz, subcarrier spacing, and channel bandwidth.
  • the NR system having 100 MHz channel bandwidth with 30 kHz subcarrier spacing has the transmission bandwidth that is composed of 273 RBs.
  • N/A may be a bandwidth-subcarrier combination that is not supported by the NR system.
  • the frequency range may be dividedly defined by FR1 and FR2 as shown in Table 3 below.
  • Table 3 Frequency range designation
  • the range of the FR1 and FR2 may be differently applied.
  • the frequency range of FR1 may be changed and applied from 450 MHz to 6000 MHz.
  • scheduling information on DL data or UL data is transferred from the base station to the terminal through downlink control information (DCI).
  • DCI may be defined in accordance with various formats, and it may corresponds to whether the DCI is scheduling information on UL data (UL grant) or scheduling information on DL data (DL grant) according to each format, whether the DCI is compact DCI having a small size of control information, whether spatial multiplexing using multiple antennas is applied, and whether the DCI is DCI for power control.
  • DCI format 1-1 that is the scheduling control information on the DL data (DL grant) may include at least one piece of the following control information.
  • the time domain resource assignment may be transferred by information on a slot on which the PUSCH is transmitted, a start OFDM symbol location S on the corresponding slot, and the number L of symbols onto which the PUSCH is mapped.
  • the location S may be a relative location from the start of the slot
  • L may be the number of contiguous symbols
  • the terminal can be configured with information on the SLIV value, the PUSCH mapping type, and the PUSCH transmission slot in one row through radio resource control (RRC) configuration (e.g., the above-described information may be configured in the form of a table).
  • RRC radio resource control
  • the base station can transfer the information on the SLIV value, the PUSCH mapping type, and the PUSCH transmission slot to the terminal by indicating index values in the configured table.
  • type A and type B have been defined as the PUSCH mapping type.
  • the first symbol of DMRS symbols is located on the second or third OFDM symbol of the slot.
  • the first symbol of the DMRS symbols is located on the first OFDM symbol in the time domain resource allocated through the PUSCH transmission.
  • the PUSCH resource mapping method may also be applied to the downlink data transmission through the physical downlink shared channel (PDSCH) in a similar manner.
  • the PDSCH mapping type may be defined as type A and type B, and particularly in the mapping type B, the first symbol of the DMRS symbols may be located on the first symbol of the PDSCH.
  • the DCI may pass through a channel coding and modulation process, and may be transmitted on a PUCCH that is a downlink physical control channel.
  • the control information being transmitted on the PDCCH or PUCCH may be expressed as a case in which the PDCCH or PUCCH is transmitted.
  • the data being transmitted on the PUSCH or PDSCH may be expressed as a case in which the PUSCH or PDSCH is transmitted.
  • the DCI is scrambled with a specific radio network temporary identifier (RNTI) (or terminal identifier) independently of respective terminals to be added with a CRC, is channel-coded, and then is configured as independent PDCCHs to be transmitted.
  • RNTI radio network temporary identifier
  • the PDCCH is mapped onto a control resource set (CORESET) configured to the terminal to be transmitted.
  • CORESET control resource set
  • the downlink data may be transmitted on a PDSCH that is a physical channel for downlink data transmission.
  • the PDSCH may be transmitted after a control channel transmission interval, and scheduling information, such as a detailed mapping location in the frequency domain and a modulation scheme, is determined based on the DCI being transmitted on the PDCCH.
  • the base station Through the MCS among the control information constituting the DCI, the base station notifies the terminal of a modulation scheme applied to the PDSCH intended to be transmitted to the terminal and the size of data (transport block size (TBS)) intended to be transmitted.
  • the MCS may be composed of 5 bits or more or less.
  • the TBS corresponds to the size of the data (transport block (TB)) that the base station intends to transmit before the channel coding for error correction is applied thereto.
  • the TB may include a medium access control (MAC) header, a MAC control element (CE), one or more MAC service data units (SDUs), and padding bits. Further, the TB may indicate a data unit being delivered from the MAC layer to the physical layer or a MAC protocol data unit (PDU).
  • MAC medium access control
  • CE MAC control element
  • SDUs MAC service data units
  • PDU MAC protocol data unit
  • the modulation scheme that is supported in the NR system may be quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (16 QAM), 64 QAM, and 256 QAM, and respective modulation orders Qm correspond to 2, 4, 6, and 8. That is, for the QPSK modulation, 2 bits per symbol may be transmitted, and for the 16 QAM, 4 bits per symbol may be transmitted. Further, for the 64 QAM, 6 bits per symbol may be transmitted, and for the 256 QAM, 8 bits per symbol may be transmitted.
  • QPSK quadrature phase shift keying
  • 16 QAM 16 quadrature amplitude modulation
  • 64 QAM 6 bits per symbol may be transmitted
  • 8 bits per symbol may be transmitted.
  • FIGS. 2 and 3 are diagrams illustrating a state where data for eMBB, URLLC, and mMTC, which are services being considered in a 5G or NR system, are allocated with frequency-time resources.
  • FIG. 2 is a diagram illustrating frequency and time resources allocated for information transmission in the NR system, according to an embodiment.
  • FIG. 2 illustrates that data for eMBB, URLLC, and mMTC are allocated in a whole system frequency band 200. If URLLC data 203, 205, and 207 is generated while eMBB 201 and mMTC 209 are allocated and transmitted in a specific frequency band, and transmission of the generated URLLC data is necessary, the URLLC data 203, 205, and 207 may be transmitted without emptying or transmitting a portion in which the eMBB 201 and the mMTC 209 have already been allocated. Because it is necessary to reduce a latency of the URLLC among the above-described services, the URLLC data 203, 205, and 207 is allocated to a portion of the resource 201 allocated to the eMBB to be transmitted.
  • the eMBB data may not be transmitted on the redundant frequency-time resources, and thus, the transmission performance of the eMBB data may be lowered. An eMBB data transmission failure due to the URLLC allocation may occur.
  • FIG. 3 is a diagram illustrating frequency and time resources allocated for information transmission in the NR system, according to another embodiment.
  • respective subbands 302, 304, and 306 that are obtained through division of a whole system frequency band 300 may be used for the purpose of transmitting services and data.
  • Information related to subband configuration may be predetermined, and this information may be transmitted from a base station to a terminal through higher signaling. Further, information related to the subbands may be optionally divided by the base station or a network node, and services may be provided to the terminal without transmission of separate subband configuration information to the terminal.
  • FIG. 3 illustrates a state where the subband 302 is used to transmit eMBB data, the subband 304 is used to transmit URLLC data, and the subband 306 is used to transmit mMTC data.
  • the length of a transmission time interval (TTI) that is used for URLLC transmission may be shorter than the length of the TTI that is used to transmit the eMBB or mMTC. Further, a response to the information related to the URLLC may be transmitted earlier than that of the eMBB or mMTC, and thus, the information can be transmitted and received with a low latency.
  • Physical layer channels used for respective types to transmit the three kinds of services or data as described above may have different structures. For example, at least one of the TTI length, frequency resource allocation unit, control channel structure, and data mapping method may differ
  • the terms "physical channel” and "signal" in an NR system may be used.
  • the contents of the disclosure may also be applied to a wireless communication system that is not the NR system.
  • a sidelink (SL) is also referred to as a signal transmission/reception path between terminals, and may be interchangeably used with a PC5 interface.
  • the base station is the subject that performs resource allocation to the terminal, and may be a base station supporting both vehicle-to-everything (V2X) communication and general cellular communication or a base station supporting only V2X communication. That is, the base station may mean an NR base station (gNB), LTE base station (eNB), or road site unit (RSU) (or fixed station).
  • gNB NR base station
  • eNB LTE base station
  • RSU road site unit
  • the terminal may include user equipment, mobile station, vehicle supporting vehicular-to-vehicular communication (V2V), vehicle supporting vehicular-to-pedestrian (V2P), pedestrian's handset (e.g., smart phone), vehicle supporting vehicular-to-network communication (V2N), vehicle supporting vehicular-to-infrastructure communication (V2I), RSU mounted with a terminal function, RSU mounted with a base station function, or RSU mounted with a part of a base station function and a part of a terminal function.
  • a DL is a radio transmission path of a signal that is transmitted from the base station to the terminal
  • an UL means a radio transmission path of a signal that is transmitted from the terminal to the base station.
  • the embodiments of the disclosure can be applied to even other various communication systems having similar technical backgrounds or channel types. Further, the embodiments of the disclosure may also be applied to other communication systems through partial modifications thereof in a range that does not greatly deviate from the scope of the disclosure by the judgment of those skilled in the art.
  • the terms "physical channel” and “signal” in the related art may be interchangeably used with data or a control signal.
  • the PDSCH is a physical channel on which data is transmitted, it may be called data in the disclosure.
  • higher signaling is a signal transfer method in which the base station transfers a signal to the terminal using a downlink data channel of a physical layer, or the terminal transfers a signal to the base station using an uplink data channel of the physical layer, and it may also be mentioned as RRC signaling or MAC CE.
  • a method and an apparatus for performing data transmission/reception between the base station and the terminal or between the terminals are provided.
  • Data may be transmitted from one terminal to a plurality of terminals, or data may be transmitted from one terminal to one terminal. Further, data may be transmitted from a base station to a plurality of terminals.
  • the data transfer is not limited thereto, but the disclosure will be able to be applied to various cases.
  • FIG. 4 is a diagram illustrating a process in which one transport block is divided into several code blocks and CRCs are added thereto, according to an embodiment.
  • a CRC 403 is added to the last or head portion of one TB 401 intended to be transmitted on an uplink or a downlink.
  • the CRC 403 may be composed of 16 bits, 24 bits, or a prefixed bit number, or may be composed of a variable bit number in accordance with channel situations.
  • the CRC 403 may be used to determine whether channel coding has succeeded.
  • a block including the TB 401 and the CRC 403 added thereto is divided into several code blocks (CBs) 407, 409, 411, and 413, in operation 405.
  • the divided code blocks may have predetermined maximum sizes, and the last code block 413 may have a size that is smaller than the size of other code blocks 407, 409, and 411.
  • the last code block 413 may be set to have the same length as the length of other code blocks 407, 409, and 411 through insertion of 0, a random value, or 1 into the last code block 413.
  • CRCs 417, 419, 421, and 423 are respectively added to the code blocks 407, 409, 411, and 413, at operation 415.
  • the CRC may be composed of 16 bits, 24 bits, or a prefixed bit number, and may be used to determine whether channel coding has succeeded.
  • the TB 401 and a cyclic generator polynomial may be used, and the cyclic generator polynomial may be defined in various methods.
  • a A -1 , CRC p 0 , p 1 , p 2 , ⁇ p L -1 may be determined as a value obtained by dividing a 0 D A+23 + a 1 D A +22 + ... + a A -1 D 24 + p 0 D 23 + p 2 D 22 + ... + p 22 D 1 + p 23 by gCRC24A(D) with a remainder of 0.
  • the CRC length L is 24, the CRC length L may be determined to include various lengths, such as 12, 16, 24, 32, 40, 48, 64, and the like.
  • the TB is divided into N CBs 407, 409, 411, and 413.
  • CRCs 417, 419, 421, and 423 are added to the divided CBs 407, 409, 411, and 413, respectively, at operation 415.
  • the CRC added to the CB may have a length that is different from the length of the CRC added to the TB, or another cyclic generator polynomial may be used.
  • the CRC 403 added to the TB and the CRCs 417, 419, 421, and 423 added to the code blocks may be omitted depending on the kind of channel code that is to be applied to the code blocks. For example, if an LDPC code, rather than a turbo code, is to be applied to the code blocks, the CRCs 417, 419, 421, and 423 to be inserted into the respective code blocks may be omitted.
  • the CRCs 417, 419, 421, and 423 may be added to the code blocks as they are. Further, even when a polar code is used, the CRCs may be added or omitted.
  • the maximum length of one code block may be determined in accordance with the kind of the applied channel coding, and in accordance with the maximum length of the code blocks, division of the TB and the CRC added to the TB into the code blocks may be performed.
  • a CRC for a CB is added to a divided CB, and data bits of the CB and the CRC are encoded with a channel code to determine coded bits, and as pre-engaged with respect to the respective coded bits, the number of the rate-matched bits may be determined.
  • the size of the TB may be calculated through the following steps.
  • Step 1 In one PRB within an allocated resource, N' RE that is the number of REs allocated to PDSCH mapping is calculated.
  • N' RE may be calculated by N sc RB ⁇ N symb sh ⁇ N DMRS PRB ⁇ N oh PRB .
  • N sc RB is 12, and N symb sh may indicate the number of OFDM symbols allocated to the PDSCH.
  • N DMRS PRB is the number of REs in one PRB occupied by a DMRS of a CDM group.
  • N oh PRB is the number of REs occupied by an overhead in one PRB configured through higher signaling, and may be configured to one of 0, 6, 12, and 18. Thereafter, the total number N RE of REs allocated to the PDSCH may be calculated.
  • N RE is calculated as min(156, N' RE ) ⁇ n PRB
  • n PRB indicates the number of PRBs allocated to the terminal.
  • Step 2 The number N info of temporary information bits may be calculated as N RE ⁇ R ⁇ Q m ⁇ v.
  • R is a code rate
  • Q m is a modulation order
  • information of these values may be transferred using a table pre-engaged with an MCS bit field in control information.
  • v is the number of allocated layers. If N info ⁇ 3824, a TBS may be calculated through step 3 below. Otherwise, the TBS may be calculated through step 4.
  • the TBS may be determined as a value that is closest to N' info among values that are not smaller than N' info in Table 4 below.
  • the TBS may be determined through N' info value and pseudo-code 1 below.
  • parity bits may be added to the CB to be outputted.
  • the quantity of parity bits may differ in accordance with an LDCP base graph.
  • a method for sending all parity bits created by LDPC coding with respect to a specific input may be called full buffer rate matching (FBRM).
  • a method for limiting the number of transmittable parity bits may be called a limited buffer rate matching (LBRM).
  • FBRM full buffer rate matching
  • LBRM limited buffer rate matching
  • resources are allocated for data transmission, an LDPC encoder output is made as a circular buffer, and bits of the made buffer are repeatedly transmitted to the extent of the allocated resources.
  • N cb becomes min( N , N ref )
  • N ref is given as ⁇ TBS LBRM C ⁇ R LBRM ⁇
  • R LBRM may be determined as 2/3.
  • TBS RBRM the above-described method for obtaining the TBS, and the maximum number of layers supported by the terminal in the corresponding cell and the maximum modulation order configured to the terminal in the corresponding cell may be assumed, and 64 QAM may be assumed in case that the maximum modulation order is not configured.
  • the code rate is 948/1024 that is the maximum code rate
  • N RE is 156 ⁇ n PRB
  • n PRB is n PRB,LBRM .
  • n PRB,LBRM may be given as in Table 5 below. [Table 5] Maximum number of PRBs across all configured BWPs of a carrier n PRB,LBRM Less than 33 32 33 to 66 66 67 to 107 107 108 to 135 135 136 to 162 162 163 to 217 217 Larger than 217 273
  • the maximum data rate supported by the terminal may be determined through mathematical Equation (1) below.
  • T s ⁇ is an average OFDM symbol length
  • T s ⁇ may be calculated as 10 ⁇ 3 14 ⁇ 2 ⁇
  • N PRB BW j ⁇ is the maximum number of RBs in BW(j).
  • OH (j) is an overhead value, which may be given as 0.14 in a downlink of FR1 (not higher than 6 GHz band) and may be given as 0.18 in an uplink, and which may be given as 0.08 in a downlink of FR2 (higher than 6 GHz band) and may be given as 0.10 in an uplink.
  • the maximum data rate in the downlink in the cell having 100 MHz frequency bandwidth in 30kHz subcarrier spacing through the Equation (1) may be calculated as in Table 7 below.
  • the actual data rate that can be measured by the terminal in the actual data transmission may be a value obtained by dividing the data amount by the data transmission time. This may be TBS in 1 TB transmission, and may be a value obtained by dividing the sum of TBSs by the TTI length in 2TB transmission.
  • the maximum actual data rate in the downlink in the cell having the 100 MHz frequency bandwidth in the 30 kHz subcarrier spacing may be determined as in Table 8 below in accordance with the number of allocated PDSCH symbols.
  • Table 7 it is possible to identify the maximum data rate supported by the terminal, and through Table 8, it is possible to identify the actual data rate following the allocated TBS.
  • the actual data rate may be higher than the maximum data rate in accordance with scheduling information.
  • the data rate that can be supported by the terminal may be pre-engaged between the base station and the terminal. This may be calculated using the maximum frequency band supported by the terminal, the maximum modulation order, and the maximum number of layers. However, the calculated data rate may be different from the value calculated from the TBS being used for the actual data transmission and the length of the TTI.
  • the terminal may be allocated with a TBS that is larger than the value corresponding to the data rate supported by the terminal itself, and to prevent this, there may be limitations in schedulable TBS in accordance with the data rate supported by the terminal.
  • FIG. 5A is a diagram illustrating one-to-one communication, that is, unicast communication, performed between two terminals through a sidelink, according to an embodiment.
  • FIG. 5A illustrates a signal 503 transmitted from a first terminal 501 to a second terminal 505, and the direction of the signal transmission may be opposite to the above-described direction. That is, the signal may be transmitted from the second terminal 505 to the first terminal 501.
  • Other terminals 507 and 509 are unable to receive the signal being exchanged through the unicast communication between the first terminal 501 and the second terminal 505.
  • the signal exchange through the unicast between the first terminal 501 and the second terminal 505 may include processes of mapping resources engaged between the first terminal 501 and the second terminal 505, scrambling using an engaged value, control information mapping, data transmission using a configured value, and identifying inherent ID values.
  • the terminal may be a terminal that moves together with a vehicle. For the unicast, transmission of separate control information, physical control channel, and data may be performed.
  • FIG. 5B is a diagram illustrating a groupcast communication in which one terminal transmits common data to a plurality of terminals through a sidelink, according to an embodiment.
  • FIG. 5B illustrates a first terminal 551 transmitting common data to other terminals 553, 555, 557, and 559 in a groupcast 561 through a sidelink, and other terminals 561 and 563 which are not included in the group are unable to receive signals being transmitted for the groupcast 561.
  • the terminal that transmits the signal for the groupcast may be another terminal in the group, and resource allocation for the signal transmission may be provided by the base station, may be provided by the terminal that serves as a leader in the group, or may be selected by the terminal that transmits the signal.
  • the terminal may be a terminal that moves together with a vehicle. For the groupcasting, transmission of separate control information, physical control channel, and data may be performed.
  • FIG. 6 is a diagram illustrating a process in which terminals having received common data through groupcasting transmit information related to data reception success or failure to a terminal having transmitted the data, according to an embodiment.
  • terminals 603, 605, 607, and 609 having received the common data through the groupcasting, transmit the information related to the data reception success or failure to a terminal 601 having transmitted the data.
  • the information may be HARQ-ACK feedback 611.
  • the terminals may be terminals having LTE-based sidelink or NR-based sidelink function.
  • the terminal having only the LTE-based sidelink function may be unable to transmit/receive NR-based sidelink signal and a physical channel.
  • the sidelink may be interchangeably used with PC5, V2X, or D2D.
  • the transmission/reception in accordance with the groupcasting is exemplified, but it may also be applied to unicast signal transmission/reception between the terminals.
  • FIG. 7 is a diagram illustrating a state in which a synchronization signal of an NR system and a PBCH are mapped onto each other in the frequency and time domain, according to an embodiment.
  • a primary synchronization signal (PSS) 701, a secondary synchronization signal (SSS) 703, and a PBCH 705 are mapped onto each other over 4 OFDM symbols.
  • the PSS 701 and the SSS 703 are mapped onto 12 RBs, and the PBCH 705 is mapped onto 20 RBs. It is illustrated in the table of FIG. 7 how the frequency bands of 20 RBs are varied in accordance with a subcarrier spacing (SCS).
  • a resource region on which the PSS 701, SSS 703, and PBCH 705 are transmitted may be referred to as an SS/PBCH block. Further, the SS/PBCH block may be referred to as an SSB block.
  • FIG. 8 is a diagram illustrating what symbols one SS/PBCH block is mapped onto in a slot, according to an embodiment.
  • FIG. 8 illustrates an LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz.
  • SS/PBCH blocks 811, 813, 815, and 817 of the NR system are transmitted in locations 801, 803, 805, and 807 in which cell-specific reference signals (CRS) being always transmitted in the LTE system can be avoided.
  • CRS cell-specific reference signals
  • FIG. 9 is a diagram illustrating symbols on which SS/PBCH blocks can be transmitted in accordance with subcarrier spacing, according to an embodiment.
  • the subcarrier spacing may be configured as 15 kHz, 30 kHz, 120 kHz, and 240 kHz, and in accordance with the subcarrier spacing, the location of a symbol in which an SS/PBCH block (or SSB block) can be located may be determined.
  • FIG. 9 illustrates the symbol location in which the SSB in accordance with the subcarrier spacing can be transmitted on each symbol within 1 ms, and it is not necessary for the SSB to always be transmitted in the region indicated in FIG. 9 . Accordingly, the location in which the SSB block is transmitted may be configured in the terminal through system information or dedicated signaling.
  • FIG. 10 is a diagram illustrating symbols on which SS/PBCH blocks can be transmitted in accordance with subcarrier spacing, according to another embodiment.
  • the subcarrier spacing may be configured as 15 kHz, 30 kHz, 120 kHz, and 240 kHz, and in accordance with the subcarrier spacing, the location of a symbol in which an SS/PBCH block (or SSB block) can be located may be determined.
  • FIG. 10 illustrates a symbol location 1009 in which the SSB block, in accordance with the subcarrier spacing, can be transmitted on each symbol within 5 ms, and the location in which the SSB block is transmitted may be configured in the terminal through system information or dedicated signaling.
  • the SS/PBCH block may be or may not be transmitted depending on the selection of the base station. Accordingly, the location in which the SSB block is transmitted may be configured in the terminal through the system information or the dedicated signaling.
  • a sidelink control channel may be referred to as a physical sidelink control channel (PSCCH), and a sidelink shared channel or a data channel may be referred to as a physical sidelink shared channel (PSSCH).
  • a broadcast channel that is broadcasted together with a synchronization signal may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel for feedback transmission may be referred to as a physical sidelink feedback channel (PSFCH).
  • the feedback transmission may be performed using the PSCCH or PSSCH.
  • the channel may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, or NR-PSSCH.
  • a sidelink means a link between terminals
  • a Uu link means a link between a base station and a terminal.
  • FIG. 11 is a diagram illustrating a resource pool that is defined as a set of resources on time and frequency being used for sidelink transmission and reception, according to an embodiment.
  • a resource pool 1110 is non-contiguously allocated on time and frequency.
  • the resource pool can also be contiguously allocated on the frequency.
  • a non-contiguous resource allocation 1120 is performed on the frequency.
  • the granularity of resource allocation on the frequency may be a PRB.
  • a resource allocation 1121 on the frequency is performed based on a sub-channel.
  • the sub-channel may be defined in the unit on the frequency composed of a plurality of RBs.
  • the sub-channel may be defined as an integer multiple of the RB.
  • the resource allocation 1121 denotes a sub-channel composed of four contiguous PRBs.
  • the size of the sub-channel may be differently configured, and although it is general that one sub-channel is composed of contiguous PRBs, it is not necessary that the sub-channel is composed of the contiguous PRBs.
  • the sub-channel may become the basic unit of resource allocation on a PSSCH or PSCCH, and thus, the size of the sub-channel may be differently configured depending on whether the corresponding channel is the PSSCH or PSCCH. Further, the term "sub-channel" may be replaced by another term, such as a RBG.
  • a start location of a sub-channel on the frequency in a resource pool is, startRBSubchanel 1122.
  • the resource block that is a frequency resource that belongs to a resource pool for the PSSCH in an LTE V2X system may be determined in the following method.
  • Non-contiguous resource allocation 1130 is performed on time.
  • the granularity of resource allocation on time may be a slot.
  • the resource pool is non-contiguously allocated on the time, the resource pool can also be contiguously allocated on the time.
  • a start location of a slot on time is startSlot 1131.
  • Subframes ( t 0 SL , t 1 SL , ... , t T max SL ) that are time resources that belong to the resource pool for the PSSCH in the LTE V2X system may be determined in the following method.
  • FIG. 12 is a diagram illustrating a scheduled resource allocation (mode 1) method in a sidelink, according to an embodiment.
  • the scheduled resource allocation (mode 1) is a method in which a base station allocates resources being used for sidelink transmission in a dedicated scheduling method to RRC-connected terminals.
  • the base station can manage the resources of the sidelink, and thus, it may be effective in performing interference management and resource pool management.
  • a terminal 1201 camps on, at 1205, and receives a sidelink system information block (SL SIB) from a base station 1203, at 1210.
  • the system information may include resource pool information for transmission/reception, configuration information for a sensing operation, information for synchronization configuration, and information for inter-frequency transmission/reception.
  • the terminal 1201 performs an RRC connection with the base station, at 1220.
  • the RRC connection between the terminal and the base station may be called a Uu-RRC.
  • the above-described Uu-RRC connection process may be performed before the data traffic is created.
  • the terminal 1201 requests the base station to provide a transmission resource for performing V2X communication, at 1230.
  • the terminal 1201 may request the transmission resource from the base station using an RRC message or a MAC CE.
  • a SidelinkUEInformation or UEAssistanceInformation message may be used as the RRC message.
  • the MAC CE may be, for example, a buffer status report MAC CE of a new format (including at least an indicator notifying of a buffer status report for V2X communication or information on the size of data being buffered for D2D communication). With respect to the detailed format and the contents of the buffer status report being used in the 3GPP, the 3GPP standards TS36.321 "E-UTRA MAC Protocol Specification" are referred to.
  • the base station 1203 allocates the V2X transmission resource to the terminal 1201 through a dedicated Uu-RRC message. This message may be included in an RRCConnectionReconfiguration message.
  • the allocated resource may be a V2X resource through the Uu or a resource for PC5 depending on the kind of traffic requested by the terminal or the congestion degree of the corresponding link.
  • the terminal may additionally send ProSe per packet priority (PPPP) or logical channel ID information of the V2X traffic through UEAssistanceInformation or MAC CE.
  • PPPP ProSe per packet priority
  • MAC CE logical channel ID information of the V2X traffic
  • the base station Because the base station is also aware of information on resources being used by other terminals, the base station allocates a remaining resource pool among the resources requested by the terminal 1201, at 1235.
  • the base station may indicate the final scheduling to the terminal 1201 by means of DCI transmission through the PDCCH, at 1240.
  • the terminal 1201 broadcasts sidelink control information (SCI) to other terminals 1202 on the PSCCH without additional RRC configuration of the sidelink, at 1260. Further, the terminal 1201 may broadcast data to other terminals 1202 on the PSSCH, at 1270.
  • SCI sidelink control information
  • the terminal 1201 may perform the RRC connection with other terminals in a one-to-one manner.
  • the RRC connection between the terminals may be referred to as a PC5-RRC.
  • the PC5-RRC is individually connected between the terminals in the group, at 1215.
  • FIG. 12 illustrates that the connection of the PC5-RRC, at 1215, is performed after 1210, it may be performed any time before 1210 or 1260.
  • the terminal 1201 performs the PC5-RRC connection of the sidelink, at 1215, and transmits the SCI to other terminals 1202 on the PSCCH through the unicast and groupcast, at 1260.
  • the groupcast transmission of the SCI may be construed as the group SCI.
  • the terminal 1201 transmits data to other terminals 1202 on the PSSCH through the unicast and groupcast, at 1270.
  • FIG. 13 is a diagram illustrating a UE autonomous resource allocation (mode 2) method in a sidelink, according to an embodiment.
  • the base station In the UE autonomous resource allocation (mode 2), the base station provides a sidelink transmission/reception resource pool for V2X as system information, and the terminal selects the transmission resource in accordance with a determined rule.
  • the resource selection method may be zone mapping or sensing based resource selection or random selection.
  • the UE autonomous resource allocation (mode 2) method of FIG. 13 is different from the scheduled resource allocation (mode 1) method in that the terminal 1301 autonomously selects the resource based on the resource pool pre-received through the system information, and transmits the data.
  • a base station 1303 allocates various kinds of resource pools (V2X resource pool and V2P resource pool) for a terminal 1301.
  • the resource pool may be composed of a resource pool on which the terminal can autonomously select an available resource pool after sensing the resources being used by other neighboring terminals, and a resource pool on which the terminal randomly selects a resource from a predetermined resource pool.
  • the terminal 1301 camps on, at 1305, and receives an SL SIB from the base station 1303, at 1310.
  • the system information may include resource pool information for transmission/reception, configuration information for a sensing operation, information for synchronization configuration, and information for inter-frequency transmission/reception.
  • the operation illustrated in FIG. 13 differs greatly from the operation illustrated in FIG. 12 in that for FIG. 12 , the base station 1203 and the terminal 1201 operate in an RRC-connected state, whereas for FIG. 13 , they may operate even in an idle mode in which the RRC is not connected. Further, even in the RRC-connected state, the base station 1303 does not directly participate in the resource allocation, and may operate so that the terminal autonomously selects the transmission resource.
  • the RRC connection between the terminal and the base station may be referred to as Uu-RRC, at 1320. If data traffic for V2X is created, at 1330, the terminal 1301 selects the resource pool of the time and/or frequency region in accordance with the transmission operation configured among the resource pools transferred from the base station 1303 through the system information.
  • the terminal 1301 broadcasts the SCI to other terminals 1302 on the PSCCH through broadcasting without additional RRC configuration of the sidelink, at 1350. Further, the terminal 1201 may broadcast data to other terminals 1302 on the PSSCH, at 1360.
  • the terminal 1301 may perform the RRC connection with other terminals in a one-to-one manner, at 1315.
  • the RRC connection between the terminals may be called a PC5-RRC.
  • the PC5-RRC is individually connected between the terminals in the group.
  • This connection of the RRC layer in the sidelink may be called the PC5-RRC.
  • UE capability information for the sidelink may be exchanged between the terminals, or the exchange of configuration information required for the signal transmission/reception may be performed.
  • FIG. 13 illustrates that the connection of the PC5-RRC at 1315 is after 1310", it may be performed any time before 1310 or 1350.
  • the terminal 1301 performs the PC5-RRC connection of the sidelink, and transmits the SCI to other terminals 1302 on the PSCCH through the unicast and groupcast, at 1350.
  • the groupcast transmission of the SCI may be construed as the group SCI.
  • the terminal 1301 transmits data to other terminals 1302 on the PSSCH through the unicast and groupcast, at 1360.
  • sensing window A and sensing window B are defined.
  • FIG. 14A is a diagram illustrating a method for configuring sensing window A for UE autonomous resource allocation (mode 2) of a sidelink, according to an embodiment.
  • a sensing window A 1402 may be defined as follows.
  • the sensing window A 1402 may be used for the main purpose of determining resources for the UE autonomous resource allocation (mode 2) through sensing of the periodic traffic.
  • the terminal may grasp the periodic resource allocation information of another terminal through the SCI decoding, and if the terminal determines that allocation of the transmission resource to the resource to be used by another terminal is not effective using the result of measuring the sidelink, such as the SL RSRP or SL RSSI, the corresponding resource may be excluded from a resource selection window 1403.
  • the resource selection window 1403 may be defined as follows.
  • Transmission resource selection method-1 When sensing is performed using only the sensing window A 1402 as illustrated in FIG. 14A , and the transmission resource selection is performed through this, the following transmission resource selection method may be used. ⁇ Transmission resource selection method-1
  • FIG. 14B is a diagram illustrating a method for configuring sensing window B for UE autonomous resource allocation (mode 2) of a sidelink, according to an embodiment.
  • sensing window B 1404 may be defined as follows.
  • the sensing window B 1404 may be used for the purpose of determining resources for UE autonomous resource allocation (mode 2) through additional sensing of periodic and aperiodic traffics with respect to the sensing window A.
  • mode 2 UE autonomous resource allocation
  • the sensing window B 1404 configured hereinafter based on a triggering slot n for selecting the transmission resource, it is possible to sense aperiodic traffic that is unable to be predicted in the sensing window A 1402 using the sidelink measurement for the slot to which an actual transmission resource can be allocated.
  • the sensing through the sensing window B 1404 may be understood as an operation of performing the sensing with respect to the traffic sensed for each slot regardless of whether the traffic is periodic or aperiodic.
  • the sensing window A and the sensing window B may be divided based on a time point where triggering for selecting the transmission resource comes down. Specifically, based on the triggering slot n for selecting the transmission resource, the previously configured sensing section may be defined as the sensing window A 1402, and the sensing section configured thereafter may be defined as the sensing window B 1404.
  • FIG. 14C is a diagram illustrating a method for configuring sensing window A and sensing window B for UE autonomous resource allocation (mode 2) of a sidelink, according to an embodiment.
  • sensing window A and sensing window B are simultaneously configured.
  • the sensing window A 1402 and the sensing window B 1404 may refer to the above-described definition.
  • the sensing is performed using both the sensing window A 1402 and sensing window B 1404, as illustrated in FIG. 14C , and the transmission resource selection is performed, the following transmission resource selection method may be used.
  • Transmission resource selection method-4 the selection of Y candidates on the higher layer may be omitted, and the following method may be used. ⁇ Transmission resource selection method-4
  • the transmission resource selection method-3 and the transmission resource selection method-4 are methods for performing the sensing in a situation where the periodic and aperiodic traffics coexist by simultaneously configuring the sensing window A 1402 and the sensing window B 1404 and optimizing the selection of the transmission resource through the sensing.
  • the sensing and the transmission resource selection in the UE autonomous resource allocation (mode 2) of the sidelink as described above may be implemented in various methods. For example, when simultaneously configuring the sensing window A 1402 and the sensing window B 1404, if the triggering for selecting the transmission resource occurs in slot n in a state where the terminal is always performing the sensing for the sensing window A 1402, the terminal may be implemented to select the final transmission resource by sensing the sensing window B 1404.
  • the terminal which always performs the sensing for the sensing window A 1402 can immediately use the sensing result of the sensing window A 1402 anytime, and thus, it has the advantage on the side of the latency in selecting the transmission resource, but it has the disadvantage on the side of energy consumption.
  • the terminal may be implemented to immediately perform the sensing for the sensing window A 1402 if a traffic to be transmitted occurs, and to select the final transmission resource by performing the sensing for the sensing window B 1404 after performing triggering for selecting the transmission resource.
  • the latter method has the advantage that it can minimize the energy consumption of the terminal, but has the disadvantage on the side of the latency in selecting the transmission resource.
  • FIG. 15 is a diagram illustrating a mode 1 method for performing sidelink data transmission through reception of scheduling information from a base station as illustrated in FIG. 12 , according to an embodiment.
  • a method for receiving scheduling information from a base station and performing sidelink communication based on the scheduling information is referred to as mode 1.
  • a terminal 1501 intended to perform transmission in a sidelink receives scheduling information 1509 for sidelink communication from a base station 1511.
  • the terminal 1501 intended to perform transmission in the sidelink may be referred to as a transmitting terminal, and a terminal 1503 performing data reception in the sidelink may be referred to as a receiving terminal.
  • the transmitting terminal 1501 and the receiving terminal 1503 may be able to perform both data transmission and reception in the sidelink.
  • the scheduling information 1509 for the sidelink communication may be obtained through reception of DCI transmitted by the base station 1511, and the DCI may include following information.
  • the scheduling may be used for one sidelink transmission, or may be used for periodic transmission, semi-persistent scheduling (SPS), or configured grant.
  • the scheduling methods may be discriminated by an indicator included in the DCI, RNTI scrambled in a CRC added to the DCI, or ID value. Zero (0) bit may be additionally added to the DCI to make the size of the DCI equal to the size of other DCI formats, such as DCI for downlink scheduling or uplink scheduling.
  • the transmitting terminal 1501 receives the SCI for sidelink scheduling from the base station 1511, transmits a PSCCH including the sidelink scheduling information 1507, and transmits a PSSCH that is the corresponding data 1505.
  • the sidelink scheduling information 1507 may be SCI, and the SCI may include the following information.
  • the control information may be included in one SCI to be transmitted to the receiving terminal, or may be included in two SCIs to be transmitted.
  • the transmission of the control information through two SCIs may be called a 2-stage SCI method.
  • the disclosure provides a method in which a terminal having received data in a sidelink transmits a feedback including an HARQ-ACK feedback and a method and an apparatus in which a terminal having transmitted data receives a feedback including an HARQ-ACK feedback.
  • a method and an apparatus are provided, in which a terminal having received data configures an HARQ-ACK feedback.
  • a method is provided for determining the size of an HARQ-ACK codebook regardless of whether actual sidelink data is transmitted and in accordance with pre-configuration, and a method is provided for determining the size of an HARQ-ACK codebook based on whether actual sidelink data is transmitted.
  • FIG. 16 is a diagram illustrating a mapping structure of physical channels mapped onto one slot on a sidelink, according to an embodiment.
  • a transmitting terminal transmits a preamble signal 1602 on one or more symbols before transmitting a corresponding slot 1601.
  • the preamble signal 1602 may be used by a receiving terminal to properly perform an automatic gain control (AGC) for adjusting the level of amplification when amplifying a power of a received signal. Further, whether to transmit the preamble signal 1602 may be determined depending on whether the transmitting terminal has transmitted the previous slot of the corresponding slot 1601. That is, when the corresponding transmitting terminal transmits a signal to the same terminal as in the previous slot, the preamble transmission may be omitted.
  • AGC automatic gain control
  • a PSCCH 1603 including control information may be transmitted on initial symbols of a slot.
  • a PSSCH 1604 being scheduled by the control information of the PSCCH may be transmitted on the initial symbols.
  • a part of SCI that is the control information may be mapped onto the PSSCH to be transmitted.
  • FIG. 16 illustrates an example in which a physical sidelink feedback channel (PSFCH) 1605 that is a physical channel on which feedback information is transmitted is located at the last part of the slot.
  • the terminal enables the terminal having transmitted/received the PSSCH to prepare for transmission or reception of the PSFCH by securing a predetermined empty time between the PSSCH 1604 and the PSFCH 1605. After the transmission/reception of the PSFCH 1605, the terminal may secure a section emptied for a predetermined time.
  • the terminal may be preconfigured with the location of the slot in which the PSFCH can be transmitted.
  • preconfigured may mean “predetermined” in the terminal preparation process, “transferred” when a sidelink-related system is accessed, “transferred” from the base station when the base station is accessed, or “transferred” from another terminal.
  • FIG. 17 is a diagram illustrating a resource capable of transmitting and receiving a PSFCH for each slot, according to an embodiment.
  • ms milliseconds
  • FIG. 18 is a diagram illustrating a resource capable of transmitting and receiving a PSFCH every four slots, according to an embodiment.
  • only a last slot 1804 among four slots 1801, 1802, 1803, and 1804 is configured to be able to transmit and receive a PSFCH 1811.
  • only a last slot 1808 among four slots 1805, 1806, 1807, and 1808 is configured to be able to transmit and receive a PSFCH 1813.
  • the index of the slot may be a slot that is determined in a resource pool. That is, the four slots 1801, 1802, 1803, and 1804 may not be physically contiguous slots, but may be contiguously appearing slots among slots belonging to the resource pool (or slot pool) that is used by a transceiver.
  • Arrows in FIG. 18 indicate slots on the PSFCH on which HARQ-ACK feedback information of the PSSCH is transmitted.
  • the HARQ-ACK information of the PSSCH being transmitted in slots 1801, 1802, and 1803 may be included in the PSFCH capable of being transmitted in slot 1804.
  • the HARQ-ACK information of the PSSCH being transmitted in slots 1804, 1805, 1806, and 1807 may be included in the PSFCH capable of being transmitted in slot 1808.
  • the reason why the HARQ-ACK feedback information of the PSSCH transmitted in slot 1804 is unable to be transmitted in the same slot 1804 is that there is not enough time for the terminal to transmit the PSFCH for the PSSCH in the slot 1804 after completing decoding of the PSSCH transmitted in the same slot 1804. That is, the minimum processing time required to prepare the PSFCH after processing the PSSCH is not small enough.
  • Determination of the number of HARQ-ACK feedback bits included in the PSFCH and of which PSSCH the HARQ-ACK bits are included may be performed based on at least one or more combinations of the following parameters.
  • Slots in which the terminal should transmit the HARQ-ACK may be calculated using the following method. If a PSFCH transmission/reception resource is configured to be located every N slots, the HARQ-ACK for the PSSCH transmitted in slot n is transmitted in the slot having the index of ⁇ n + 1 / N ⁇ ⁇ N .
  • ⁇ x ⁇ means the smallest integer among integers that are larger than x.
  • the above-described formula may be a formula determined to perform an embodiment of FIG. 18 .
  • the above-described formula can be used to be replaced by a formula n+N-mod(n,N).
  • mod(a,b) means a remainder obtained by dividing a by b.
  • the above-described equation can be normalized and applied as follows. If the PSFCH transmission/reception resource is located every N slots, the HARQ-ACK for the PSSCH transmitted in slot n is transmitted in a slot having an index of ⁇ n + ⁇ / N ⁇ ⁇ N .
  • ⁇ is a parameter that means a gap between the PSSCH received by the terminal and the transmission slot of the HARQ-ACK, and may be configured for each resource pool, may be a pre-configured value, or may be understood as the same value between the terminals through the PC5-RRC configuration.
  • the ⁇ value may be differently defined in accordance with the SCS, and for example, may be a value that is determined or configured as in Table 9 below. [Table 9] SCS ⁇ 15kHz 1 30kHz 1 60kHz 2 120kHz 2
  • the proposed ⁇ value may be variously modified and applied.
  • the HARQ-ACK timing method may be provided as follows. If the PSFCH transmission/reception resource is configured to be located every N slots, the PSFCH being transmitted in slot n includes the HARQ-ACK feedback information of the PSSCH transmitted in slots n-N, n-N+1, ..., n-2, n-1.
  • the PSFCH may include the HARQ-ACK feedback information of the PSSCH transmitted in N slots before the slot n.
  • the HARQ ACK feedback information for the PSSCH being transmitted in slots n-1, n-2, n-3, and n-4 may be included.
  • the above-described method can be normalized and applied in the following method. That is, it may mean that the PSFCH including the HARQ-ACK feedback for the PSSCH transmitted in slots n-N- ⁇ +1, n-N- ⁇ +2, ..., n- ⁇ -1, n- ⁇ is transmitted in slot n.
  • the above-described method may be applied to secure a time corresponding to about at least ⁇ slots as the time for the terminal to process the PSSCH and to prepare the PSFCH. If the PSCCH or PSSCH is not received in the coreesponding slot, the receiving terminal may determine the HARQ-ACK value as a fixed value, such as "0".
  • the ⁇ is the parameter that means the gap between the PSSCH received by the terminal and the transmission slot of the HARQ-ACK, and may be configured for each resource pool, may be a pre-configured value, or may be understood as the same value between the terminals through the PC5-RRC configuration. Further, the ⁇ may be differently defined in accordance with the transmission type, such as the unicast or groupcast.
  • the second embodiment provides a method and an apparatus for determining a HARQ-ACK codebook based on SCI being transmitted from a transmitting terminal.
  • the transmitting terminal may transmit a PSCCH for scheduling a PSSCH to transmit the PSSCH, and SCI including scheduling information may be mapped onto the PSCCH.
  • the SCI may include the following information.
  • an SAI bit field may or may not exist in the SCI depending on the HARQ-ACK codebook configuration information. Further, a part of the SAI bit field may mean the order of PSSCHs in one codebook, such as a counter, in accordance with the configuration information, and the remaining bits may be used as information indicating the size of the codebook. Further, the whole SAI bit field information may mean the order of HARQ-ACK bit values of the corresponding scheduled PSSCHs in accordance with the configuration information.
  • the third embodiment provides a method and an apparatus for applying different timing parameters in accordance with the processing capability of a terminal when applying the first embodiment.
  • the terminal may process the SL-SCH included in the PSSCH or data during reception of the PSSCH, and the processing may include channel estimation, modulation or demodulation, and channel code decoding of data.
  • the processing may include channel estimation, modulation or demodulation, and channel code decoding of data.
  • a terminal having a high processing capability may require a short time required to perform the decoding of the data.
  • a terminal having a low processing capability may require a long time required to perform the decoding of the data. Accordingly, the timing to transmit the feedback of the data may differ depending on the processing capability of the terminal.
  • the HARQ-ACK for the PSSCH transmitted in slot n may be transmitted in a slot having an index of ⁇ n + ⁇ / N ⁇ ⁇ N .
  • ⁇ is a parameter that means a gap between the PSSCH received by the terminal and the transmission slot of the HARQ-ACK, and may be a value that is determined or configured in accordance with the processing time capability of the terminal, that is, the capability of how fast the terminal can process the PSSCH.
  • the ⁇ value may be determined as 2 with respect to the terminal capable of performing normal processing (in the disclosure, it may be referred to as "capability type 1"), whereas in the above-described formula, the ⁇ value may be determined as 1 with respect to the terminal capable of performing fast processing (in the disclosure, it may be referred to as "capability type 2").
  • the ⁇ value may be provided as in Table 10 below.
  • the information on the processing capability of the terminal may be exchanged between the terminals using the PC5-RRC.
  • SCS ⁇ for processing capability type 1 ⁇ for processing capability type 2 15kHz 2 1 30kHz 2 1 60kHz 3 2 120kHz 3 2
  • Embodiment 3-1 provides a method for determining the number of HARQ-ACK bits or the size of the HARQ-ACK codebook and a time to transmit the feedback when the terminal intends to transmit the HARQ-ACK on the PSFCH in a state where the PSFCH resource does not exist for each slot and N (N is an integer larger than "1") is configured.
  • the terminal receiving the PSSCH maps the HARQ-ACK feedback information of the PSSCH onto the PSFCH in slot n+x to be transmitted using x which is the smallest one of integers that are equal to or larger than ⁇ .
  • ⁇ may be a value preconfigured by the transmitting terminal or may be a value configured in the resource pool from which the corresponding PSSCH or PSFCH is transmitted.
  • each terminal may pre-exchange its own capability with the transmitting terminal.
  • ⁇ may be a value determined in accordance with at least one of the SCS, the terminal capability, configuration value with the transmitting terminal, or the resource pool configuration.
  • the slot in which the HARQ-ACK feedback is transmitted may be determined as in FIG. 19.
  • FIG. 19 is a diagram illustrating the terminal transmitting the HARQ-ACK feedback, according to an embodiment.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be 2 bits on all PSFCHs.
  • the receiving terminal when the receiving terminal is unable to receive the transmitted PSSCH, or is unable to receive the PSCCH for scheduling the PSSCH both in slot n and in slot n+2, it is not necessary to transmit the PSFCH including the HARQ-ACK feedback information in slot n+3.
  • the receiving terminal when the receiving terminal has received the transmitted PSSCH in slot n+3, but is unable to receive the transmitted PSSCH or is unable to receive the transmitted PSCCH for scheduling the PSSCH in slot n+4, the receiving terminal will be able to transmit one bit of the HARQ-ACK information for slot n+3 in slot n+8.
  • the receiving terminal when the receiving terminal has received the transmitted PSSCH in slot n+3, but is unable to receive the transmitted PSSCH or is unable to receive the transmitted PSCCH for scheduling the PSSCH in slot n+4, the receiving terminal will be able to transmit the HARQ-ACK information for slot n+3 and the HARQ-ACK information for slot n+4 in slot n+8. In this case, because the receiving terminal is unable to receive the PSSCH in slot n+4, the receiving terminal will be able to transmit the feedback through configuration of the HARQ-ACK feedback for slot n+4 to NACK.
  • the receiving terminal may determine the number of HARQ-ACK feedback bits to be included in the PSFCH.
  • the number of HARQ-ACK feedback bits may be determined by Equation (2) below.
  • the number of HARQ-ACK bits to be included in PSFCH being transmitted in slot n the number of slots included in a corresponding resource pool among slot k ⁇ ⁇ + 1 to slot n ⁇ ⁇
  • slot k may be a slot including a PSFCH resource configured to be able to be transmitted just before the PSFCH that can be transmitted in slot n.
  • FIG. 20 is a diagram illustrating the maximum number of HARQ-ACK feedback bits that a terminal should transmit on one PSFCH, according to an embodiment.
  • the terminal may transmit HARQ-ACK feedback bits as many as the number of corresponding slots on the PSFCH in slot n in consideration of slot (n- ⁇ -N+1- ⁇ +1) to slot (n- ⁇ ).
  • the terminal may transmit HARQ-ACK feedback bits as many as the number of corresponding slots on the PSFCH in slot n in consideration of slot (n- ⁇ -N+1- ⁇ +1) to slot (n- ⁇ ).
  • the terminal may transmit HARQ-ACK feedback bits as many as the number of corresponding slots on the PSFCH in slot n in consideration of slot (n- ⁇ -N+1- ⁇ +1) to slot (n- ⁇ ).
  • the terminal may transmit HARQ-ACK feedback bits as many as the number of corresponding slots on the PSFCH in slot n in consideration of slot (n- ⁇ -N+1- ⁇ +1) to slot (n- ⁇ ).
  • the terminal may transmit HARQ-ACK feedback bits as many as the number of corresponding slots on the PSFCH in slot n in consideration of slot (n- ⁇ -N+1- ⁇
  • FIG. 21 is a diagram illustrating the terminal transmitting the HARQ-ACK feedback, according to another embodiment.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be 1 bit, 2 bits, or 3 bits in accordance with the slot.
  • the terminal will be able to transmit, in slot n+8, the PSFCH including the HARQ-ACK feedback information as in slot n+2, slot n+3, and slot n+4.
  • the terminal When receiving control information for scheduling at least one PSSCH in slot n+2, slot n+3, and slot n+4, the terminal includes 3-bit HARQ-ACK feedback information in the PSFCH to be transmitted, and in the slot in which the PSSCH is unable to be received, the terminal may configure the feedback information to NACK to be transmitted.
  • the number of feedback bits may be determined as the maximum number of bits that should be transmitted in all cases in consideration of the slots belonging to the resource pool, N, and ⁇ . That is, in this method, in consideration of FIG. 21 , the maximum bit number that can be transmitted in all cases is 3, and thus, it may be determined to transmit always 3 bits.
  • the number of feedback bits may be determined by a method for calculating the number of slots where the PSSCH, which may be related to the HARQ-ACK feedback to be transmitted on the PSFCH in the slot in which the PSFCH is to be transmitted, can be transmitted in consideration of the slots belonging to the resource pool, N, and ⁇ . That is, in this method, in consideration of FIG. 21 , the terminal may be determined to transmit, on the PSFCH, one bit in slot n, 2 bits in slot n+3, 3 bits in slot n+8, one bit in slot n+12, 2 bits in slot n+14, and 2 bits in slot n+16, respectively.
  • FIG. 22 is a diagram illustrating the terminal transmitting the HARQ-ACK feedback, according to another embodiment.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be 0 bit, 1 bit, 2 bits, 3 bits, or 4 bits in accordance with the slot.
  • the terminal will be able to transmit, in slot n+8, the PSFCH including the HARQ-ACK feedback information as in slot n+2, slot n+3, slot n+4, and slot n+5.
  • the terminal When receiving control information for scheduling at least one PSSCH in slot n+2, slot n+3, slot n+4, and slot n+5, the terminal includes 4-bit HARQ-ACK feedback information in the PSFCH to be transmitted, and in the slot in which the PSSCH is unable to be received, the terminal may configure the feedback information to NACK to be transmitted.
  • FIG. 23 is a diagram illustrating the terminal transmitting the HARQ-ACK feedback, according to another embodiment.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be 2 bits, 3 bits, 4 bits, 5 bits, or 6 bits in accordance with the slot.
  • the terminal will be able to transmit, in slot n+12, the PSFCH including the HARQ-ACK feedback information as in slot n+1, slot n+2, slot n+3, slot n+4, slot n+5, and slot n+6.
  • the terminal When receiving control information for scheduling at least one PSSCH in slot n+1, slot n+2, slot n+3, slot n+4, slot n+5, and slot 6, the terminal includes 6-bit HARQ-ACK feedback information in the PSFCH to be transmitted, and in the slot in which the PSSCH is unable to be received, the terminal may configure the feedback information to NACK to be transmitted.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be increased over N bits in accordance with N and ⁇ .
  • the terminal may send only the last K bit of the feedback that should be sent, and may not transmit the remaining bits.
  • K may be equal to N that is the PSFCH resource configuration period, but is not limited thereto.
  • FIG. 24 is a diagram illustrating the terminal transmitting the HARQ-ACK feedback, according to another embodiment.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be 0 bit, 1 bit, 2 bits, 3 bits, or 4 bits in accordance with the slot.
  • slot n+12 there may be no sidelink slot in which the corresponding PSSCH, on which the HARQ-ACK feedback should be sent, is to be received. That is, a case may exist, in which there is not the feedback bit to be transmitted on the PSFCH resource of a specific slot in accordance with N, ⁇ , and resource pool configuration, and the minimum number of bits to transmit the HARQ-ACK feedback may be given in Equation (4) below.
  • the minimum number of HARQ ⁇ ACK feedback bits that should be transmitted by the terminal on one PSFCH max N ⁇ ⁇ + 1 , 0
  • max(a, b) is a larger value between a and b. That is, in the example provided in FIG. 23 , the HARQ-ACK to be transmitted does not always exist in slot n+12, and thus, the terminal may consider that the PSFCH resource does not exist in the corresponding slot. That is, although the PSFCH resource exists, the PSSCH transmission/reception will be able to be performed through disregarding of the corresponding PSFCH resource.
  • N may be configured among values including at least one of 1, 2, and 4, but is not limited to such an example. Further, the configuration may differ for each resource pool.
  • the corresponding PSSCH may be a PSSCH for unicast or groupcast, which is configured or indicated to transmit the HARQ-ACK, and is transmitted from the same terminal. That is, on the PSSCH on which it is not necessary to send the HARQ-ACK, it may not be necessary to apply the proposed technique.
  • the PSCCH for scheduling the PSSCH may be control information for scheduling the PSSCH, and it is not always necessary to transmit the control information on the PSCCH.
  • the control information may be one piece of control information, a plurality of pieces of control information may schedule one PSSCH.
  • the terminal having received the PSSCH transmits HARQ-ACK feedback information of the PSSCH on the PSFCH that is fastest among PSFCHs having a gap between the PSSCH and the PSFCH that is equal to or larger than y symbols.
  • y may be a value preconfigured by the transmitting terminal or a value configured in the resource pool from which the corresponding PSSCH or PSFCH is transmitted.
  • each terminal may pre-exchange its own capability with the transmitting terminal, or y may be determined in accordance with the subcarrier spacing.
  • Embodiment 3-2 provides a method and an apparatus for configuring a PSFCH resource in a resource pool.
  • FIG. 25 is a diagram illustrating physical slot indexes and logical slot indexes of slots included in a resource pool configured in accordance with resource pool configuration in physical slots, according to an embodiment.
  • slot n+7 may be included in the resource pool after slot n+3, and logical slot indexes may be contiguously given to slot k+3 and slot k+4.
  • the PSFCH resource may be periodically configured every N slots in the resource pool (i.e., the PSFCH resource is periodically configured every N slots using the logical slot indexes), and in contrast, the PSFCH resource may be periodically configured every N slots using physical slot indexes. According to this method, the PSFCH resource may not be periodically configured in the logical slot indexes.
  • the number of HARQ-ACK feedback bits that should be transmitted by the terminal may be increased over N bits in accordance with N and ⁇ . In this case, it is necessary to transmit information corresponding to a large number of bits on the PSFCH, and this may cause a decoding error probability of the PSFCH to be increased. Accordingly, the terminal may send only the last K bit of the feedback that should be sent, and may not transmit the remaining bits. As described above, K may be equal to N that is the PSFCH resource configuration period, but is not limited thereto.
  • the fourth embodiment provides a method and an apparatus capable of solving or mitigating the problem that one terminal should perform both transmission and reception of the PSFCH in a state where the PSFCH resource does not exist for each slot and N (N is an integer that is larger than " 1") is configured. This problem may occur due to half-duplex restriction in that the terminal is unable to simultaneously perform transmission and reception of signals.
  • FIG. 26 is a diagram illustrating terminal 1 (UE1) and terminal 2 (UE2) transmitting PSFCHs in the same slot for HARQ-ACK feedback transmission for respective transmitted PSSCHs when the terminal 1 and the terminal 2 perform signal transmission and reception by a connection through unicast or groupcast communication in a sidelink, according to an embodiment.
  • Terminal 1 has transmitted a PSSCH 2602 to terminal 2 in slot 1 2600, and terminal 2 has transmitted a PSSCH 2612 to terminal 1 in slot 2 2610.
  • the feedback timing may be determined so that terminal 2 transmits, in slot 4 2620, the HARQ-ACK feedback for the PSSCH transmitted from terminal 1 to terminal 2 in slot 1, and terminal 1 transmits, in slot 4 2620, the HARQ-ACK feedback for the PSSCH transmitted from terminal 2 to terminal 1 in slot 2.
  • Terminal 2 may transmit the PSFCH including the feedback information for the PSSCH transmitted in slot 1 to terminal 1, and terminal 1 may transmit the PSFCH including the feedback information for the PSSCH transmitted in slot 2 to terminal 2.
  • Terminal 1 and terminal 2 should perform both the transmission and reception of a PSFCH 2622, and the transmission and reception of the PSFCH 2622 may be performed in the same symbol.
  • the terminal being unable to simultaneously perform transmission and reception of a certain signal may be a case in which the terminal has a half-duplex restriction, and in contrast, the terminal being able to simultaneously perform transmission and reception of a certain signal may be a case in which the terminal has a full-duplex function.
  • the terminal that is considered as a half-duplex terminal is configured to perform transmission or reception of the PSFCH without simultaneously performing transmission and reception, as the terminal selects and performs the transmission or reception of the sidelink, it may be possible to combine and apply one or more of the following methods.
  • terminal 1 receives the PSFCH in the slot 4 2620, terminal 2 transmits the PSFCH in the slot 4 2620, and the PSFCH may include the HARQ-ACK feedback information for the PSSCH transmitted by terminal 1 in the slot 1 2600.
  • whether to transmit the PSFCH may be determined so that the PSFCH including the HARQ-ACK information for the earlier transmitted PSSCH is transmitted based on the earlier transmitted PSSCH.
  • the HARQ-ACK for the PSSCH transmitted in slot n is transmitted in slot ⁇ n + ⁇ / N ⁇ ⁇ N . Further, the HARQ-ACK may be transmitted in slot n+N+ ⁇ -1-mod(n+ ⁇ -1,N).
  • ⁇ is a parameter defining a gap between the PSSCH received by the terminal and the transmission slot of the HARQ-ACK, and may be configured for each resource pool, may be a pre-configured value, or may be understood to the terminals through the PC5-RRC configuration. As described above, the ⁇ value may be differently defined in accordance with the SCS. That is, it means that the PSFCH including the HARQ-ACK feedback for the PSSCH transmitted in slot n-N- ⁇ +1, n-N- ⁇ +2, ... , n- ⁇ -1, n- ⁇ is transmitted in slot n.
  • the first transmitted PSSCH that is, the PSFCH including the HARQ-ACK for the PSSCH that terminal 1 has transmitted to terminal 2 in slot n-N- ⁇ +1
  • terminal 1 may receive the PSFCH in slot n
  • terminal 2 may transmit the PSFCH in slot n
  • the PSFCH may include the HARQ-ACK for the PSSCH that the terminal 1 has transmitted to terminal 2 in slot.
  • the fifth embodiment provides a method and an apparatus capable of solving or mitigating the problem that one terminal should transmit the PSFCH to several terminals in a state where the PSFCH resource does not exist for each slot and N (N is an integer that is larger than "1") is configured.
  • N is an integer that is larger than "1"
  • This problem may occur due to a restriction in that the terminal is able to transmit only one physical channel at a time.
  • a PSFCH transmission method has been described when one terminal should transmit the PSFCH to several terminals, but it will be also possible to apply the contents of this embodiment even when one terminal transmits a plurality of PSFCHs according to a plurality of transmission types to one or two or more terminals. That is, this embodiment can also be applied when one terminal should transmit the PSFCH for unicast and the PSFCH for groupcast to other terminals in the same symbol in the same slot.
  • FIG. 27 is a diagram illustrating a time when terminal 1 (UE1) should transmit two PSFCHs in the same slot for HARQ-ACK feedback transmission for PSSCHs that terminal 2 (UE2) and terminal 3 (UE3) have transmitted to terminal 1 (UE1) when UE1 performs signal transmission and reception with UE2 and UE3 by a connection through unicast or groupcast communication, according to an embodiment.
  • terminal 2 and terminal 3 may be different from each other, or may be the same terminal.
  • the PSFCH transmission method has been described when one terminal should transmit the PSFCH to several terminals, but if this embodiment is applied when one terminal transmits a plurality of PSFCHs according to a plurality of transmission types to one terminal, the terminal 2 and terminal 3 may be the same terminal.
  • UE2 has transmitted PSSCH 2702 to UE1 in slot 1 2700, and UE3 has transmitted PSSCH 2712 to UE1 in slot 2 2710.
  • the PSFCH transmission/reception timing may be determined so that UE1 transmits HARQ-ACK feedback information for two PSSCHs to UE2 and UE3 in slot 4 2720 by encoding the HARQ-ACK feedback information on PSFCHs 2722.
  • UE1 can transmit the PSFCH (hereinafter, PSFCH 2) to UE2 and the PSFCH (hereinafter, PSFCH 3) to UE3 in all in the slot 4 2720, UE2 and UE3 can simultaneously receive the PSFCH from UE1, and can identify the HARQ-ACK feedback information for the PSSCH sent by UE2 and UE3 themselves.
  • PSFCH 2 and PSFCH 3 in the slot 4 2720, it is necessary for UE1 to determine which PSFCH UE1 should transmit.
  • the reason why UE1 is unable to simultaneously transmit PSFCH 2 and PSFCH 3 may be that insufficient transmission power is provided, and if divided power is used for each of the PSFCHs, the coverage of the respective PSFCHs may be reduced.
  • the terminal selects and transmits (or receives) one PSFCH to prevent the terminal from simultaneously transmitting or receiving two or more PSFCHs.
  • terminal 1 transmits the PSFCH to terminal 2 in the slot 4 2720, and the PSFCH may include the HARQ-ACK feedback information for the PSSCH transmitted by terminal 2 in the slot 1 2700.
  • whether to transmit the PSFCH may be determined so that the PSFCH including the HARQ-ACK information for the earlier transmitted PSSCH is transmitted based on the earlier transmitted PSSCH.
  • the HARQ-ACK for the PSSCH transmitted in slot n is transmitted in slot ⁇ n + ⁇ / N ⁇ ⁇ N .
  • the HARQ-ACK may be transmitted in slot n+N+ ⁇ -1-mod(n+ ⁇ -1,N).
  • ⁇ is a parameter defining a gap between the PSSCH received by the terminal and the transmission slot of the HARQ-ACK, and may be configured for each resource pool, may be a pre-configured value, or may be understood to the terminals through the PC5-RRC configuration.
  • the ⁇ value may be differently defined in accordance with the SCS. That is, the PSFCH including the HARQ-ACK feedback for the PSSCH transmitted in slot n-N- ⁇ +1, n-N- ⁇ +2, ... , n- ⁇ -1, n- ⁇ is transmitted in slot n.
  • the first transmitted PSSCH that is, the PSFCH including the HARQ-ACK for the PSSCH that terminal 1 has received from terminal 2 in slot n-N- ⁇ +1, may be transmitted/received in slot n.
  • both terminal 2 and terminal 3 attempt to perform decoding of the PSFCH in slot n, and because terminal 1 has transmitted the PSFCH to terminal 2, only terminal 2 may be successful in receiving the PSFCH.
  • terminal 1 may deploy the HARQ-ACK information for the PSSCH received from terminal 2 in slot n-N- ⁇ +1 at the first location of the N pices of HARQ-ACK information, and may deploy the HARQ-ACK information for the PSSCH received from terminal 3 in slot n-N- ⁇ +2 at the second location of the N pieces of HARQ-ACK inforamtion to be transmitted.
  • the terminal may configure the HARQ-ACK feedback codebook by configuring the HARQ-ACK feedback corresponding to the slot to a predetermined value. For example, terminal 1 may determine the HARQ-ACK feedback value for the PSSCH that has not been trasnmitted as a value that means NACK.
  • the first to fifth embodiments have been described individually.
  • the respective embodiments include related operations, and thus, it is possible to combine at least two embodiments.
  • transmitters, receivers, and processors of a terminal and a base station are illustrated in FIGS. 28 and 29 .
  • the transmission/reception method between the base station and the terminal or between the transmitting end and the receiving end has been provided, and in order to perform the method, the receivers, processors, and transmitters of the base station and the terminal should operate according to the respective embodiments.
  • FIG. 28 is a block diagram illustrating the internal structure of a terminal, according to an embodiment.
  • the terminal includes a terminal receiver 2800, a terminal transmitter 2804, and a terminal processor 2802.
  • the terminal receiver 2800 and the terminal transmitter 2804 may be commonly called a transceiver.
  • the transceiver may transmit/receive a signal with a base station.
  • the signal may include control information and data.
  • the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise-amplifying and down-converting the frequency of a received signal.
  • the transceiver may receive a signal through a radio channel, and may output the received signal to the terminal processor 2802.
  • the transceiver may also transmit the signal that is output from the terminal processor 2802 on the radio channel.
  • the terminal processor 2802 may control a series of processes so that the terminal operates according to the above-described embodiments of the disclosure.
  • the terminal receiver 2800 receives control information from the base station, the terminal processor 2802 determines whether to transmit the HARQ-ACK feedback and feedback information in accordance with the control information and preconfigured configuration information. Thereafter, the terminal transmitter 2804 may transfer the scheduled feedback to the base station.
  • FIG. 29 is a diagram illustrating the internal structure of a base station, according to an embodiment.
  • a base station includes a base station receiver 2901, a base station transmitter 2905, and a base station processor 2903.
  • the base station receiver 2901 and the base station transmitter 2905 may be commonly called a transceiver.
  • the transceiver may transmit/receive a signal with a terminal.
  • the signal may include control information and data.
  • the transceiver may be composed of an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise-amplifying and down-converting the frequency of a received signal.
  • the transceiver may receive a signal through a radio channel, and may output the received signal to the base station processor 2903.
  • the transceiver may also transmit the signal that is output from the base station processor 2903 through the radio channel.
  • the base station processor 2903 may control a series of processes so that the base station operates according to the above-described embodiments of the disclosure.
  • the base station processor 2903 may control to configure control information in accordance with HARQ-ACK feedback information of the terminal and to receive the feedback in accordance with the control information. Thereafter, the base station transmitter 2905 transmits related scheduling control information, and the base station receiver 2901 receives the feedback information together with the scheduling information.
  • Embodiments of the disclosure described herein are merely for easy explanation of the technical contents of the disclosure and proposal of specific examples to help understanding of the disclosure, but are not intended to limit the scope of the disclosure. That is, it will be apparent to those of ordinary skill in the art to which the disclosure pertains that other modified examples that are based on the technical idea of the disclosure can be embodied. Further, according to circumstances, the respective embodiments may be operated in combination. Further, other modified examples based on the technical idea of the above-described embodiments may be embodied in an LTE system and 5G system.

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Claims (14)

  1. Ein Verfahren, das von einem Endgerät in einem Kommunikationssystem durchgeführt wird, wobei das Verfahren Folgendes umfasst:
    Empfangen einer Vielzahl von Sidelink-Daten, einschließlich erster Sidelink-Daten und zweiter Sidelink-Daten, von einem oder mehreren Endgeräten;
    Bestimmen, ob eine erste Ressource zum Übertragen erster Rückmeldeinformationen für die ersten Sidelink-Daten und eine zweite Ressource zum Übertragen zweiter Rückmeldeinformationen für die zweiten Sidelink-Daten einander überlappen; und
    für den Fall, dass sich die erste Ressource und die zweite Ressource überlappen, Übermittleln von Rückmeldeinformationen an ein oder mehrere Endgeräte, die einer der ersten Rückmeldeinformationen oder der zweiten Rückmeldeinformationen mit höherer Priorität entsprechen,
    wobei eine Priorität, die jedem der mehreren Sidelink-Daten entspricht, auf Sidelink-Steuerinformationen basiert, die jedes der mehreren Sidelink-Daten planen, und Ressourcen für Rückkopplungsinformationen auf der Grundlage einer Mindestanzahl von Schlitzen zwischen Sidelink-Daten und entsprechenden Rückkopplungsinformationen identifiziert werden.
  2. Das Verfahren nach Anspruch 1, wobei die Priorität durch ein Feld der Sidelink-Kontrollinformation angezeigt wird.
  3. Das Verfahren nach Anspruch 1 umfasst ferner:
    Übermittleln von dritten Sidelink-Daten an ein anderes Endgerät;
    Empfangen von vierten Sidelink-Daten von einem anderen Endgerät;
    Identifizieren, ob eine dritte Ressource zum Empfangen dritter Rückmeldeinformationen für die dritten Sidelink-Daten und eine vierte Ressource zum Übertragen vierter Rückmeldeinformationen einander überlappen; und
    für den Fall, dass sich die dritte Ressource und die vierte Ressource überlappen, Senden oder Empfangen von Rückmeldeinformationen, die einer der dritten Rückmeldeinformationen und der vierten Rückmeldeinformationen entsprechen und eine höhere Priorität haben.
  4. Das Verfahren nach Anspruch 1, wobei die Ressourcen für die Rückmeldeinformationen ferner auf der Grundlage eines Zeitraums der Ressourcen identifiziert werden.
  5. Das Verfahren nach Anspruch 4, wobei der Zeitraum der Ressourcen und die Mindestanzahl von Slots in den Konfigurationsinformationen des Ressourcenpools enthalten sind.
  6. Das Verfahren nach Anspruch 4, wobei die Rückkopplungsinformation in einem ersten Schlitz unter einer Vielzahl von Schlitzen, die die Ressourcen enthalten, übertragen wird.
  7. Ein Endgerät für ein Kommunikationssystem, wobei das Endgerät umfasst:
    einen Transceiver; und
    eine Steuerung, die konfiguriert ist zum:
    Empfangen, von einem oder mehreren Endgeräten über den Transceiver, einer Vielzahl von Sidelink-Daten, einschließlich erster Sidelink-Daten und zweiter Sidelink-Daten,
    Bestimmen, ob eine erste Ressource zum Übertragen einer ersten Rückkopplungsinformation für die ersten Sidelink-Daten und eine zweite Ressource zum Übertragen einer zweiten Rückkopplungsinformation für die zweiten Sidelink-Daten einander überlappen, und
    für den Fall, dass sich die erste Ressource und die zweite Ressource überlappen, Übertragen von Rückmeldeinformationen, die einer der ersten Rückmeldeinformationen oder der zweiten Rückmeldeinformationen mit höherer Priorität entsprechen, über den Transceiver an ein oder mehrere Endgeräte,
    wobei eine Priorität, die jedem der mehreren Sidelink-Daten entspricht, auf Sidelink-Steuerinformationen basiert, die jedes der mehreren Sidelink-Daten planen, und Ressourcen für Rückkopplungsinformationen auf der Grundlage einer Mindestanzahl von Schlitzen zwischen Sidelink-Daten und entsprechenden Rückkopplungsinformationen identifiziert werden.
  8. Das Endgerät nach Anspruch 7, wobei die Priorität durch ein Feld der Sidelink-Kontrollinformation angezeigt wird.
  9. Das Endgerät nach Anspruch 7, wobei der Controller außerdem konfiguriert ist zum:
    Senden, über den Transceiver, dritter Sidelink-Daten an ein anderes Endgerät,
    Empfangen, von einem anderen Endgerät über den Transceiver, vierter Sidelink-Daten,
    Identifizieren, ob eine dritte Ressource zum Empfangen von dritten Rückmeldeinformationen für die dritten Sidelink-Daten und eine vierte Ressource zum Senden von vierten Rückmeldeinformationen einander überlappen, und
    für den Fall, dass sich die dritte Ressource und die vierte Ressource überlappen, über den Transceiver Rückmeldeinformationen zu senden oder zu empfangen, die einer der dritten Rückmeldeinformationen oder der vierten Rückmeldeinformationen mit höherer Priorität entsprechen.
  10. Das Endgerät nach Anspruch 7, wobei die Ressourcen für die Rückmeldeinformationen weiterhin auf der Grundlage eines Zeitraums der Ressourcen identifiziert werden.
  11. Das Endgerät nach Anspruch 10, wobei der Zeitraum der Ressourcen und die Mindestanzahl der Slots in den Konfigurationsinformationen des Ressourcenpools enthalten sind.
  12. Das Endgerät nach Anspruch 10, wobei die Rückmeldeinformation in einem ersten Schlitz unter einer Vielzahl von Schlitzen, die die Ressourcen enthalten, übertragen wird.
  13. Das Verfahren nach Anspruch 1 umfasst ferner:
    für den Fall, dass die ersten Sidelink-Daten früher als die zweiten Sidelink-Daten empfangen werden, die erste Ressource und die zweite Ressource einander überlappen und die Prioritäten, die den ersten Sidelink-Daten und den zweiten Sidelink-Daten entsprechen, gleich sind, die erste Rückmeldeinformation früher als die zweite Rückmeldeinformation zu übertragen.
  14. Endgerät nach Anspruch 7, wobei der Controller ferner so konfiguriert ist, dass er die erste Rückmeldeinformation früher als die zweite Rückmeldeinformation sendet, falls die ersten Sidelink-Daten früher als die zweiten Sidelink-Daten empfangen werden, die erste Ressource und die zweite Ressource einander überlappen und die Prioritäten, die den ersten Sidelink-Daten und den zweiten Sidelink-Daten entsprechen, gleich sind.
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US20220239447A1 (en) 2022-07-28
CN113785649A (zh) 2021-12-10
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US11296850B2 (en) 2022-04-05
US11943168B2 (en) 2024-03-26
US20200351057A1 (en) 2020-11-05
WO2020222575A1 (en) 2020-11-05

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